Stock-Based Employee Compensation (Summary Of Stock Option Activity) (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 13, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period, Shares | shares	927,675
Exercised, Shares | shares	(52,327)
Forfeited, Shares | shares	(122,125)
Outstanding at end of period, Shares | shares	753,223
Options exercisable at end of period, Shares | shares	648,348
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period, Weighted average exercise price | $ / shares	$ 18.33
Exercised, Weighted average exercise price | $ / shares	13.00
Forfeited, Weighted average exercise price | $ / shares	21.22
Outstanding at end of period, Weighted average exercise price | $ / shares	18.23
Options exercisable at end of period, Weighted average exercise price | $ / shares	$ 17.73
Outstanding at end of period, Weighted average Remaining Contractual Term	5 years 9 months 18 days
Options exercisable at end of period, Weighted average Remaining Contractual Term	5 years 8 months 12 days
Outstanding at end of period, Aggregate Intrinsic Value | $	$ 981
Options exercisable at end of period, Aggregate Intrinsic Value | $	$ 981